<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>count-down-container</title>
</head>
<body>
   <div id="count-down-container" class="count-down-container">
     倒计时:<span id="count-down" class="count-down"></span>
   </div>
</body>
<script src="./main.js"></script>
</html>